Antiglare shield and method of making the same



' July 24,1928.

Y. l i 1,678,218 R. M. vcsRUss ANTIGLARE SHIELD AND METHOD 0F MKING THESAM w A v-"v Filed June 21, 1925 T D (HF. l x l XX L")`\ (j) L/ I @Q10 XL" j Ill :lil

Jvwentoc vPatented! July 24,' 1928.

ROLAND M. GRUSS, OF SAN FRANCISCO, CALIFORNIA.

Application led .Tune 21,

This invention relates to anti-glare shields.

for automobiles, although it may be used for other purposes.

An object of my present invention is the provision of an anti-glareshield which in a light of average intensity allows objects seen throughit to appear in their natural colors, but whichv in comparatively brightlight such as sunshine, becomes colored so that the intensity of thelight is diminished.

Another object ofmy invention is the provision of an anti-glare shieldwhich in the night time will not obstruct the vision to any appreciabledegree when light of ordinary intensity passes through it, 'but whichwill become colored when a strong light, as from an oncoming automobile,Astrikes it, whereby the glare usually caused by the headlights ofoncoming automobiles will be eliminated.

A still further object of my invention is the provision of an anti-glareshield which will change from a substantially colorless state to acolored state as the intensity of the light passing through it isincreased.

'A further object of my invention is the provision of a method of makingan antiglare shield of the character mentioned.

Other objects will be appreciated by those skilled in the art.

In the drawing accompanying this application,

Figure l is a plan view of an anti-glare shield embodying my invention,

Figures 2 and 3 are sections taken respectively on lines 2 2 and 3 3 ofFigure l.

Referring to the drawings for a more detailed description thereof, thenumerals 5 and 6 indicate two sheets of solid transparent material whichare preferably colorless and may be of glass or other suitable material.The sheets 5 and 6 are separated from each other and they may beseparated from each other to any suitable extent, but preferably theyare very slightly separated, as shown in Figures 2 and 3, in which casethe distance between them may be of the order of one one-thousandth ofan inch.

The sheets are separated from each other by a layer of a binding agent7, such for example as cement, which is adapted to hold the sheets orplates together. This binding agent is interposed between the plates andextends around the borders thereof and may be of a width proportionatelyshown in Figure l. The space between the plates is filled ANTIGLARESHIELD AND METHOD OF MAKING THE SAME.

1926. Serial No. 117,451.'

with a material which changes its color as the intensity of lightpassing through it is increased, and preferably this material iscolorless when light of comparatively low intensity passes through it,and becomes colored when a light of comparatively high intensity passesthrough it.

Further, I prefer to employ a substance of thev character describedwhich is green or yellowish green when exposed to bright light, sincethese colors are very effective in eliminating glare.

The material of the character described which I place lbetween theplates is preferably in the liquid state, and may be for example, asolution of a substance having substantially the light-responsivequalities of a solution of uranin or of a solution of fluorescein or ofa solution of a compound of or of a salt of tluorescein, and thesolution preferably has the light-responsive quality of a thin layer ofa dilute solution of fluorescein or 'uranin or a salt of liuorescein,and may be a solution of the mentioned substances, and preferably adilute solution of these substances. A solution of a material of thecharacter described, or of the substances mentioned, ispreferably a'socaller] non-freezing solution, and such solution may be an alcoholic oran etheric solution. The reason for employing a non-freezing solutionwill be evident when it is considered that the sheets of transparentsolid material may be of glass and sealed together.

The antl-glare shield described may be made by spreading on one of thesheets a layer of a solution of the character mentioned, and the othersheet may then be placed on the rst sheet in contact with the solution,but such a method results in the formation of bubbles in the liquid,which of course are undesirable. However, according to mynew method ofmaking theantiglare shield, I apply a layer which is preferably thin ofa binding agent to the border of one of the sheets or plates, leavinghowever, parts of the border as indicated at 9 and l() in Figure l freefrom the bindingr agent which holds the plates together. I then placethe other sheet or plate in contact with the adhesive material orbinding agent and apply a pressure to the plates from opposite sides inorder to secure good contact of the binding agent with the plates. Ithen introduce a. solution of the character mentioned, through eitherthe opening 9 or 10, the other opening being provided for the exit ofair which will be forced outwardly therethrough throughk the atmosphereby the liquid or solution introduced. The two openings may not benecessary, but I have Jfound that the two are preferable, especiallywhere the plates are only very slightly separated. After the spacebetween the plates has been filled with the liquid or solution, theopenings 9 and 10 are filled in with any suitable material, such forexample the material employed to bind the ,plates together. v

While I have described one embodiment of my invention, modificationsthereof may be readily devised without departing from the spirit of myinvention, and it is to be understood that such modilications comewithin the scope of the appended claims.

A dilute solution which I have successfully employed between glassplates-is made by dissolving one part b weight of uranin v ywhich is thesodium sa t of luorescein 1n two thousand parts by weight of ethylalcohol.

I claim 1. An anti-glare shield comprising two panes of solidtransparent material slightly separated from each other and secured to'-gether, and a dilute, non-freezing solution of fluorescein compoundtherebetween.

2. An anti-glare shield comprising two panes of solid transparentmaterial slightly separated from each other and secured together by alayer ofadhesive material around the borders of said panes and a dilutealcoholic solution of 'luorescein compound therebetween.

3. An anti-glare shield comprising two pan-es of solid transparentmaterial s eparated rom each other and secured together and a solutionof fluorescein compound therebetween.

4. An anti-glare shield comprising two panes of solid transparentmaterial separated from each other and secured t0- gether and a solutionof a salt of fluorescein therebetween.

5. An anti-glare shield comprisingtwo panes of solid transparentmaterial separated from each other and secured together and a solutionof uranin therebetween.

6. An anti-glare shield comprising two sheets of solid transparent,substantially colorless material and a material -therebetween havingsubstantially the light respon- .sive qualities of a thin lay-er of adilute alcoholic solution of a compound comprising fiuorescein. y

7. The method of making an anti-glare shield which comprises applying athin layer of adhesive material to a first sheet of vsolid transparentmaterial around the borders thereotl excepting two parts thereof,placing a second sheet of solid transparent material on said first sheetso that its borders contact with said adhesive material, filling thespace between said sheets with a desired liquid and sealing the partsleft open for the introduction of th-e mentioned liquid.

8. Two transparent sheets cemented together along the edges so as toform a flat chamber, and a iuorescein 4medium filling y said chamber.

ROLAND M. GRUSS.

